En Iso 13920-bf ❲2K 2024❳
If you saw "EN ISO 13920-BF" on a drawing or welding symbol, it is likely a typo or shorthand used by a designer. The correct standard for edge preparations is ISO 9692-1 (or EN ISO 9692-1).
EN ISO 13920 only covers general tolerances (linear, angular, flatness, etc.), not weld preparation shapes.
On a technical drawing:
ISO 13920-BF
Tolerance class: CL-M (medium)
Backing: Removable copper backing
Process: 135 (MAG) en iso 13920-bf
For parts where centering is important (e.g., a boss on a plate). If you saw "EN ISO 13920-BF" on a
| Nominal Size (mm) | Permitted Deviation (Class B) | | :--- | :--- | | Up to 120 | 1 mm | | 120 to 400 | 2 mm | | Over 400 | 3 mm | For parts where centering is important (e
